INTRODUCTION:

This document contains the release notes for the 2.4 version of Apache Commons Lang.
Commons Lang is a set of utility functions and reusable components that should be of use in any Java environment.

Lang 2.4 no longer attempts to target the Java 1.1 environment and now targets Java 1.2. While previous versions 
were built for 1.1, some parts were using methods that were only available in 1.2, and the Enum class had 
become dependent on Java 1.3. 

INCOMPATIBLE CHANGES WITH VERSION 2.3:

- None

INCOMPATIBLE CHANGES WITH VERSION 2.2:

- Calling stop on a suspended StopWatch will no longer change the underlying time. 
  It's very unlikely anyone was relying on that bug as a feature.

ADDITIONAL INCOMPATIBLE CHANGES WITH VERSION 2.0:

- The Nestable interface defines the method indexOfThrowable(Class).
Previously the implementations checked only for a specific Class.
Now they check for subclasses of that Class as well.
For most situations this will be the expected behavior (i.e. it's a bug fix).
If it causes problems, please use the ExceptionUtils.indexOfThrowable(Class) method instead.
Note that the ExceptionUtils method is available in v1.0 and v2.0 of commons-lang and has not been changed.
(An alternative to this is to change the public static matchSubclasses flag on NestableDelegate.
However, we don't recommend that as a long-term solution.)

- The StopWatch class has had much extra validation added.
If your code previously relied on unusual aspects, it may no longer work.

- Starting with version 2.1, Ant version 1.6.x is required to build. Copy 
junit.jar to ANT_HOME/lib. You can get JUnit from https://www.junit.org. See the developer's guide
for more details.

DEPRECATIONS FROM 2.3 to 2.4:

- ObjectUtils.appendIdentityToString(StringBuffer, Object) - has very odd semantics, use 
  ObjectUtils.identityToString(StringBuffer, Object) instead.

- public static java.util.Date add(java.util.Date, int, int) - it is not intended for this 
  method to be public. Please let us know if you use this. 

DEPRECATIONS FROM 2.2 to 2.3:

- None

DEPRECATIONS FROM 2.1 to 2.2:

- None

DEPRECATIONS FROM 2.0 to 2.1:

- The enum package has been renamed to enums for JDK 1.5 compliance.
All functionality is identical, just the package has changed.
This package will be removed in v3.0.

- NumberUtils.stringToInt - renamed to toInt

- DateUtils - four constants, MILLIS_IN_* have been deprecated as they were defined
as int not long. The replacements are MILLIS_PER_*. 


BUG FIXES IN 2.4:

    * [LANG-76 ] - EnumUtils.getEnum() doesn't work well in 1.5
    * [LANG-328] - LocaleUtils.toLocale() rejects strings with only language+variant
    * [LANG-334] - Enum is not thread-safe
    * [LANG-346] - Dates.round() behaves incorrectly for minutes and seconds
    * [LANG-349] - Deadlock using ReflectionToStringBuilder
    * [LANG-353] - Javadoc Example for EqualsBuilder is questionable
    * [LANG-360] - Why does appendIdentityToString return null?
    * [LANG-361] - BooleanUtils toBooleanObject javadoc does not match implementation
    * [LANG-363] - StringEscapeUtils..escapeJavaScript() method did not escape '/' into '\/', it will make IE render page incorrectly
    * [LANG-364] - Documentation bug for ignoreEmptyTokens accessors in StrTokenizer
    * [LANG-365] - BooleanUtils.toBoolean() - invalid drop-thru in case statement causes StringIndexOutOfBoundsException
    * [LANG-367] - FastDateFormat thread safety
    * [LANG-368] - FastDateFormat getDateInstance() and getDateTimeInstance() assume Locale.getDefault() won't change
    * [LANG-369] - ExceptionUtils not thread-safe
    * [LANG-372] - ToStringBuilder: MULTI_LINE_STYLE does not print anything from appendToString methods.
    * [LANG-380] - infinite loop in Fraction.reduce when numerator == 0
    * [LANG-381] - NumberUtils.min(floatArray) returns wrong value if floatArray[0] happens to be Float.NaN
    * [LANG-385] - https://commons.apache.org/proper/commons-lang/developerguide.html "Building" section is incorrect and incomplete
    * [LANG-393] - EqualsBuilder don't compare BigDecimals correctly
    * [LANG-399] - Javadoc bugs - cannot find object
    * [LANG-410] - Ambiguous / confusing names in StringUtils replace* methods
    * [LANG-412] - StrBuilder appendFixedWidth does not handle nulls
    * [LANG-414] - DateUtils.round() often fails

IMPROVEMENTS IN 2.4:

    * [LANG-180] - adding a StringUtils.replace method that takes an array or List of replacement strings
    * [LANG-192] - Split camel case strings
    * [LANG-257] - Add new splitByWholeSeparatorPreserveAllTokens() methods to StringUtils
    * [LANG-269] - Shouldn't Commons Lang's StringUtils have a "common" string method?
    * [LANG-298] - ClassUtils.getShortClassName and ClassUtils.getPackageName and class of array
    * [LANG-321] - Add toArray() method to IntRange and LongRange classes
    * [LANG-322] - ClassUtils.getShortClassName(String) inefficient
    * [LANG-326] - StringUtils: startsWith / endsWith / startsWithIgnoreCase / endsWithIgnoreCase / removeStartIgnoreCase / removeEndIgnoreCase methods
    * [LANG-329] - Pointless synchronized in ThreadLocal.initialValue should be removed
    * [LANG-333] - ArrayUtils.toClass
    * [LANG-337] - Utility class constructor javadocs should acknowledge that they may sometimes be used, e.g. with Velocity.
    * [LANG-338] - truncateNicely method which avoids truncating in the middle of a word
    * [LANG-345] - Optimize HashCodeBuilder.append(Object)
    * [LANG-351] - Extension to ClassUtils: Obtain the primitive class from a wrapper
    * [LANG-356] - Add getStartTime to StopWatch
    * [LANG-362] - Add ExtendedMessageFormat to org.apache.commons.lang.text
    * [LANG-371] - ToStringStyle javadoc should show examples of styles
    * [LANG-374] - Add escaping for CSV columns to StringEscapeUtils
    * [LANG-375] - add SystemUtils.IS_OS_WINDOWS_VISTA field
    * [LANG-379] - Calculating A date fragment in any time-unit
    * [LANG-383] - Adding functionality to DateUtils to allow direct setting of various fields.
    * [LANG-402] - OSGi-ify Lang
    * [LANG-404] - Add Calendar flavour format methods to DateFormatUtils
    * [LANG-407] - StringUtils.length(String) returns null-safe length
    * [LANG-413] - Memory usage improvement for StringUtils#getLevenshteinDistance()